ST VD6283 - Parallel als and Flicker Measure Using an External Adc

A.4 Parallel ALS and flicker measure using an external adc
CustomerPrivate client;
void *hdl;
int als_started = 0;
int start_flk = 0;
// sensor initialization
Error = STALS_Init("VD6283", &client, &hdl);
// First configure device settings
Error = STALS_SetInterMeasurementTime(hdl, 0, &current_inter_measurement);
Error = STALS_SetExposureTime(hdl, 50000, &current_exposure);
Error = STALS_SetGain(hdl, STALS_CHANNEL_1, 0x0100, &current_gain);
Error = STALS_SetGain(hdl, STALS_CHANNEL_6, 0x0a00, &current_gain);
Error = STALS_SetFlickerOutputType(hdl, STALS_FLICKER_OUTPUT_ANALOG);
// start platform adc capture
Platform_capture_adc_start();
// main loop
do {
update_display = 0;
if (!als_started) {
Error = STALS_Start(hdl, STALS_MODE_ALS_SINGLE_SHOT, STALS_CHANNEL_1);
als_started = 1;
}
// Flicker must be started after als
if (!start_flk) {
Error = STALS_Start(hdl, STALS_MODE_FLICKER, STALS_CHANNEL_6);
start_flk = 1;
}
// ALS acquisition
Error = STALS_GetAlsValues(hdl, STALS_CHANNEL_1, &meas, &is_valid);
if (is_valid) {
als_value = meas.CountValue[0];
update_display = 1;
Error = STALS_Stop(hdl, STALS_MODE_ALS_SINGLE_SHOT);
als_started = 0;
}
// Check if adc data are ready to update the flicker frequency
Platform_capture_adc_frame(data, &is_flk_valid);
if (is_flk_valid) {
Platform_fft(data, data_fft);
flk_frequency = Platform_flk_detect(data_fft);
update_display = 1;
}
// update display if we have new als or flicker data
if (update_display)
display(als_value, flk_frequency);
} while(!exit_loop);
// stop platform adc capture
Platform_capture_adc_stop();
// stop ALS acquisition and flicker sampling
Error = STALS_Stop(hdl, STALS_MODE_FLICKER);
if (als_started)
Error = STALS_Stop(hdl, STALS_MODE_ALS_SINGLE_SHOT);
// Release sensor
Error = STALS_Term(&hdl);
UM2878
Parallel ALS and flicker measure using an external adc
UM2878 - Rev 1
page 23/27